AI Rate Card

OpenAI: o4 Mini · fastrouter

OpenAI o4-mini combines exceptional efficiency with sophisticated reasoning capabilities in a compact model from the o-series. Released in April 2025, this streamlined solution maintains powerful multimodal and agentic capabilities while significantly reducing computational requirements. The model achieves remarkable benchmark performance, including near-perfect scores on AIME with Python (99.5%) and competitive results on SWE-bench, outperforming its predecessor o3-mini and approaching the larger o3 model in several domains. Despite its optimized size, o4-mini excels in STEM tasks, visual problem-solving (MathVista, MMMU), and code editing applications. Its refined reinforcement learning architecture enables sophisticated capabilities like tool chaining, structured output generation, and multi-step task completion with minimal latency—often resolving complex problems in under a minute, making it ideal for high-throughput scenarios prioritizing both speed and quality.

Base modelAll models on this baseAll models of the providerto the provider

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Input, $/1M $1.10

Output, $/1M $4.40

Cache read $0.28

Cache write —

Context 200 000

Max output 100 000

Accepts images, text

Last checked 04.11.2026 12:00:14 UTC

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API

OpenAI-compatible API: the official OpenAI SDKs work with this base URL. Replace YOUR_API_KEY with your key from the provider.

API base URL
https://go.fastrouter.ai/api/v1
Endpoint
https://go.fastrouter.ai/api/v1/chat/completions
Model id
openai/o4-mini
curl
curl https://go.fastrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "openai/o4-mini", "messages": [{"role": "user", "content": "Hello!"}], "max_tokens": 256}'
Python
import requests

r = requests.post(
    "https://go.fastrouter.ai/api/v1/chat/completions",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    json={
      "model": "openai/o4-mini",
      "messages": [
        {
          "role": "user",
          "content": "Hello!"
        }
      ],
      "max_tokens": 256
    },
)
print(r.json())
JavaScript
const r = await fetch("https://go.fastrouter.ai/api/v1/chat/completions", {
  method: "POST",
  headers: {Authorization: "Bearer YOUR_API_KEY", "Content-Type": "application/json"},
  body: JSON.stringify({
    "model": "openai/o4-mini",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ],
    "max_tokens": 256
  }),
});
console.log(await r.json());
Request (JSON)
{
  "model": "openai/o4-mini",
  "messages": [
    {
      "role": "user",
      "content": "Hello!"
    }
  ],
  "max_tokens": 256
}
Response (JSON)
{
  "id": "chatcmpl-...",
  "object": "chat.completion",
  "model": "openai/o4-mini",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Hi! How can I help?"
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 9,
    "completion_tokens": 12,
    "total_tokens": 21
  }
}

The address is taken from the provider's model list; check it against the provider's documentation.

Provider's API documentation

Source: AI Rate Card, https://airatecard.com/en/c/offer%3Afastrouter%7Copenai/o4-mini, prices checked 2026-11-04; seller's page: https://fastrouter.ai/models/openai/o4-mini

Technical details

ID: offer:fastrouter|openai/o4-mini